Feature: 1. Immediate Response: CO alarm has highly efficient sensors that immediately detect smoke and CO, alerting you to hazardous situations. 2. Dual Function Design: Smoky alarm integrates fire, smoke and CO alarms to ensure home safety, which is convenient and practical for you. 3. High Sensitivity: Smoke detector accurately detects small changes in smoke and CO concentration, reducing the chance of false alarms and missed alarms. 4. Durable Construction: CO detector alarm is made of premium material, which is high strength, reliable, sturdy and durable and has a long service life. 5. Easy Installation: The smoke And CO alarm is designed to be easy to install, so you can easily and quickly install it, for a variety of home environments. Specification: Item Type: CO AlarmMaterial: ABSBattery Type: Lithium battery Battery Model: 1.5VAAx3 Sensor: Semiconductor sensor, electrochemical sensor. Alarm Setting Value: Smoke 0.3db/M. CO gas alarm value: Concentration <50 PPM no alarm Concentration ≥50PPM to ≥99PPM, alarm in 60 to 90 min. Concentration ≥100PPM to ≥299PPM, alarm within 10 to 40 minutes. Concentration ≥300PPM, alarm within 3 minutes. Environmental Conditions: Indoor temperature -10°C to 55°C Relative Humidity ≦95 % RH Response Time: Less than 30 seconds Recovery Time: Less than 30 seconds Alarm Mode: Sound light alarm Alarm Volume: ≧70dB(Approx. 1 meter/3.3ft directly in front). Package List: 1 x CO Alarm2 x Screws2 x Expansion Screws1 x English Instruction Manual